PHP verification code class example sharing

This article mainly introduces a practical PHP verification code class for everyone, which has certain reference value. Interested friends can refer to it. I hope it can help everyone.

code.php is a verification code class. The name of the class is best to be the same as the file name, which is beneficial to our viewing.

code.php

number=$number;
    $this->codeType=$codeType;
    $this->width = $width;
    $this->height= $height;
    
    //生成验证码函数
    $this->code = $this ->createCode();
    
  }
  public function __get($name){
    if ($name == 'code'){
      return $this->code;
    }
    return false;
  }
  /*获取验证码*/
  public function getCode() {
    return $this->code;
  }
  /*图像资源销毁*/
  public function __destruct(){
    imagedestroy($this->image);
  }
  protected function createCode(){
    //通过你的验证码类型生成验证码
    switch ($this->codeType){
      case 0: //纯数字
        $code = $this->getNumberCode();
        break;
      case 1: //纯字母的
        $code = $this->getCharCode();
        break;
      case 2: //数字和字母混合
        $code = $this->getNumCharCode();
        break;
      default:
        die('不支持此类验证码类型');
    }
    return $code;
  }
  protected function getNumberCode(){
    $str = join('', range(0, 9));
    return substr(str_shuffle($str),0, $this->number);
  }
  protected function getCharCode(){
    $str = join('', range('a', 'z'));
    $str = $str.strtoupper($str);
    return substr(str_shuffle($str),0,$this->number);
  }
  protected function getNumCharCode(){
    $numstr = join('',range(0, 9));
    $str =join('', range('a', 'z'));
    $str =$numstr.$str.strtoupper($str);
    return substr(str_shuffle($str), 0,$this->number);
  }
  protected function createImage(){
    $this->image = imagecreatetruecolor($this->width, 
        $this->height);
  }
  protected function fillBack(){
    imagefill($this->image, 0, 0, $this->lightColor());
  }
  /*浅色*/
  protected function lightColor(){
    return imagecolorallocate($this->image, mt_rand(133,255), mt_rand(133,255), mt_rand(133,255));
  }
  /*深色*/
  protected function darkColor(){
    return imagecolorallocate($this->image, mt_rand(0,120), mt_rand(0,120), mt_rand(0,120));
  }
  protected function drawChar(){
    $width = ceil($this->width / $this->number);
    for ($i=0; $i< $this->number;$i++){
      $x = mt_rand($i*$width+5, ($i+1)*$width-10);
      $y = mt_rand(0, $this->height -15);
      imagechar($this->image, 5, $x, $y, $this->code[$i], $this->darkColor());
    }
  }
  protected function drawLine(){
    for ($i=0;$i<5;$i++) {
      imageline($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$this->darkColor());
    }
  }
  protected function drawDisturb(){
    for ($i=0;$i<150;$i++){
      $x=mt_rand(0, $this->width);
      $y=mt_rand(0, $this->height);
      imagesetpixel($this->image, $x, $y, $this->lightColor());
    }
  }
  protected function show(){
    header('Content-Type:image/png');
    imagepng($this->image);
  }
  public function outImage(){
//     创建画布
    $this->createImage();
//     填充背景色
    $this->fillBack();
//     将验证码字符串花到画布上
    $this->drawChar();
//     添加干扰元素
    $this->drawDisturb();
//     添加线条
    $this->drawLine();
//     输出并显示
    $this->show();
  }
}

test.php is a new verification code and saves it to the session. It plays the role of preservation and storage for the verification of our verification code.

test.php

getCode();
$code->outImage();

login.php is the final verification.

login.php

alert('验证码正确!');"; 
      }else{ 
        echo ""; 
      } 
    } 
  ?> 
   
   
     
       
       
       
    
 
     
      
 
        
 
          
 
            用户名： 
             
          
 
          
 
            密码： 
             
          
 
          
 
            验证码： 
             
             
          
 
          
 
             
          
 
        
 
      
 
     
  

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